Track-lifting jack



TRACK LIFTING JACK Filed March 3, 1924 2 hee heet 1 via-T:-

J mm e/56% 566%22247124 Patented Sept. 22, 1925.

manners; I-IAQKMANN, or CHICAGO, ILLINOIS.

'rIuicK-LIF' INe JACK. j

Application filed March 3, 1924; Serial No. 696,419.

T 0 all whom it may concern. Be it known that I, FREDERICK HAGKMANN,

V a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Track-Lifting Jack; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanyingdrawings, and to the numerals of reference marked thereon which form a part of this specification.

This invention relates to a lifting jack of that type involving a slidable rack adapted for engaging the object to be shifted.

It is an object of this invention to simplify the construct-ion andopera-t-ion-of a lifting jack and adapting the same primarily for use in elevating railroad rails and the like.

The invention comprises the novel structure and combinations hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawings which illustrate a preferred embodiment of this invention and in which similar reference numerals refer to similar features in the different views.

Figure 1 is a side elevational view of the lifting jack.

Figure 2 is an enlarged, broken and sectional view through the lifting jack.

Figure 3 is an enlarged sectional view taken upon theline 33 of Fig. 2.

Figure 4 is a rear elevational view of the lifting jack.

Figure 5 is a broken front elevational view of a modified form of lifting jack.

Figure 6 is a sectional view of the lifting jack upon the line 6-6 of Fig. 5.

Figure 7 is a reduced sectional view taken upon the line 77 of Fig. 5.

Referring to Figs. 1 to 4 of the drawings,

there is shown a lifting jack comprising a base 1 having a pair of spaced standards 2 rising therefrom. The front portions of these standards are inwardly ofit'set as indicated at 3, and the front margins are flanged toward each other as indicated at 4 to define retaining lips for a slidable rack 5 mounted between the offset portions 3 and having a lifting foot or lug 6 at its lower end and a platform 6 at its upper end. The teeth 7 of the rack bar do not extend to the lateral edges thereof; a smooth margin being left on each side as shown in Fig. 3-,

A spur gear 8 meshes with the rack bar 5. This gear has polygonal hubs 9 extending from both sides, and it is journalled upon a shaft 10 supported near the top of the standards 2. These hubs extend into the space defined by the smooth margins of the rack and the shoulders formed by the offset portions 2. I r

A holding pawl 11- having polygonal hubs 12 similar to and of the same size as the hubs of the gear 8 is journalled upon a shaft 13 secured in the standards 2 at a suitable dis tance below the gear 8.

The gear 8 is adapted to be rotated by a lever 14 having a bifurcated end, the forks 15 of which have polygonal jaws or recesses which fit the polygonal hubs 9 and 12 of the gear and pawl. After a load has been raised by the rack bar and it is desired to lower the same, the lever 14 may be applied to the pawl for disengaging the same from the rack bar. In the use of this jack, either the foot 6 or the head 6 may be placed under the load to be lifted.

In Figs. 5, 6 and 7 there is illustrated a jack having a base 17 from which a channel shaped standard 18 rises which is provided with a slot 19 in its front face which extends to a suitable height for accommodating a lifting foot 20 upon the lower end of a rack bar 21 slidably mounted against the web of the channel like standard and retained by a pair of lugs 22 extending from the sides of the standard, and a pair of hub 26 joining them together, and which are journalled-upon a shaft supported upon the standards.

Below the gears 25 are a pair of holding pawls 27 having a common polygonal -hub 28, and being journalled upon a shaft supported by the standard 18. A pair of lugs 29 extend from sides of the standard 18 over these pawls for limiting the outward movement thereof. 'One of the pawls 25 may be provided with a handle 30 whereby the pawls may be lifted out of engagement with the rack teeth 24 with which they normally engage. I

In the operation of the jack, the usual track wrench may be applied tothe polygenal hub 2?? of the gears for rotating the same for elevating the rack bar and the load supported upon the foot 20. For adjusting the elevated load to a particular height, the holding pawls may be controlled by the handle 30. However when it is desired to lower the elevated load, the wrench may be applied to the polygonal hub 28 of the pawls for rotating them and throwing the same out of operative relation with the rack bar.

I am aware that many changes may be made. and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

'1. In a hitting jack, a base, a standard rising from the base and provided with a. guideway, a rack bar slidabl-y mounted in said guideway, a gear having a polygonal hub rotatably supported by said standard for meshing relation with said rack bar, a holding pawl for said rack having a polygonal hub similar to the above mentioned hub, and an operating lever adapted for engagement with either of said hubs.

2. In a lifting jack, a base, comprising a standard having a guideway, a rack bar having a plurality of rows of teeth mounted in said guideway, and a plurality of gears having a common polygonal hub engaging said rack bar.

In testimony whereof I have hereunto subscribed my name.

FREDERICK HACKMANN. 

